The LEGO City Seasonal theme (Advent Calendars) are annual LEGO sets released offering a countdown to Christmas. Each set includes 24 small builds, one to be opened and assembled each day from December 1st to December 24th. The calendars typically feature minifigures, tiny vehicles, and festive-themed items, providing a daily LEGO surprise in the lead-up to Christmas.
2009 LEGO Sets
2009 celebrated the 10th anniversary of LEGO Star Wars and the 50th anniversary of the LEGO brick. New themes included Space Police III, Power Miners, and a revival of Pirates, while Agents 2.0 continued the high-tech spy concept. LEGO Mindstorms NXT 2.0 refined its robotics platform with enhanced sensors and programmability. The year also saw the conclusion of the original Batman line, Exo-Force, Mars Mission, and Belville, as LEGO phased out older themes in favor of new directions.